The festvox project, based at Carnegie Mellon University, distributes documentation, scripts, and examples that should be sufficient for an interested person to build her own synthetic voices in currently supported languages or new languages in the University of Edinburgh's Festival Speech Synthesis System. The quality of the result depends much on the time and skill of the builder. For English, it may be possible to build a new voice in a couple of days' work; a new language may take months or years to build.
fillrio.sh is a standalone shell script that loads random MP3 files to all available memory in your rio. The RIO utility is required to interface with the RIO hardware. Special features of this tool include the ability to recursively scan your music archive directories, specify search strings and add to what's already loaded.
gamp is an ncurses-based console MP3 frontend for any sajber-jukebox compatible player, including mpg123 and amp. gamp was written to have most of the functionality of other X-based MP3 players. It includes an excellent playlist editor with support for loading and saving m3u playlists, as well as a fully functional player.